ApplicationThe grinding-polishing machine is a double-disc desktop&comma; operated by two people simultaneously&comma; applicable to pre-grinding&comma; grinding and polishing of metallographic sample&period; The machine regulates its speed by a frequency changer&comma; with a speed of 50-1000rpm&comma; thus widening its application&period; The machine is an indispensable equipment in making the metallographic sample&period; The machine has a cooling device to cool the sample during pre-grinding&comma; thus preventing the damage of the metallographic structure caused by overheat of the sample&period; The machine&comma; easy to use&comma; safe and reliable&comma; is an ideal preparation equipment for the labs of plants&comma; research institutes and universities and colleges&period;